Synthesis method of methylal

Abstract

The invention relates to a synthesis method of methylal, and belongs to the technical field of chemical product preparation. The synthesis method comprises the specific steps: pumping formaldehyde into a formaldehyde synthesis tower by a formaldehyde feeding pump, mixing with methanol coming from a methanol measuring tank and pumped by a methanol feeding pump, and carrying out a reaction to generate methylal under the action of a catalyst in a reactive rectifying tower; adjusting the feeding ratio and the feeding amount to control the purity and the yield of the product, adjusting the reaction temperature to control the reaction speed and the content of effective substances in waste water, and ensuring to reach waste water discharge requirements; and taking out the product gas from the top of the reactive rectifying tower, and cooling the product by utilizing two condensers connected with each other in series. The method is simple in operation, low in consumption of the raw materials, and high in conversion rate; and the product is qualified and discharged at a time, and has stable quality.

Description

technical field [0001] The invention relates to a solid acid one-time synthesis method, in particular to a synthesis method for generating methylal by reacting methanol and formaldehyde under the action of a catalyst, and belongs to the technical field of chemical product preparation. Background technique [0002] Energy is the foundation of national economic development, and one of the three most noteworthy key issues in my country's economic development is the issue of energy structure. As a primary energy source, petroleum resources have only 40 years left to recover from the world's average recoverable reserves. Since 1993, my country has changed from an oil exporter to an importer, and the shortage of oil is increasing year by year. In 2000, my country imported 70 million tons of crude oil and 30 million tons of refined oil. Experts predict that by 2005, my country's oil imports will reach 115 million tons, and in 2010 it will reach 150 million tons. Therefore, it is...

AI Technical Summary

Problems solved by technology

At present, most methylal production enterprises in China use sulfuric acid catalytic method for production. Because the production of this process requires 98% concentrated sulfuric acid as a catalyst, the production process is relatively cumbersome, the process operation is mostly manual, and the product index is difficult to control. There are many uncertain factors in the quality. The biggest disadvantage is that the production process will produce a large amount of waste water with high acid content and low conversion rate. The waste water treatment cost is quite expensive, resulting in relatively high production cost of methylal. The National Environmental Protection Agency Most of the process manufacturers have been ordered to suspend business for rectification